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Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | May. 31, 2015 | May. 31, 2014
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Assets, Fair Value Disclosure [Abstract] |  |
Cash | $ 615 | $ 780
Assets at Fair Value | 5,932 | 5,149
Cash and Cash Equivalents | 3,852 | 2,220
Short-term Investments | 2,072 | 2,922
Other Long-term Assets | 8 | 7
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 869 | 1,137
Cash and Cash Equivalents | 225 | 151
Short-term Investments | 644 | 986
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 4,440 | 3,225
Cash and Cash Equivalents | 3,012 | 1,289
Short-term Investments | 1,428 | 1,936
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Time deposits |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 684 | 227
Cash and Cash Equivalents | 684 | 227
Short-term Investments | 0 | 0
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | U.S. Agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 976 | 1,027
Cash and Cash Equivalents | 110 | 25
Short-term Investments | 866 | 1,002
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Commercial paper and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 914 | 959
Cash and Cash Equivalents | 352 | 25
Short-term Investments | 562 | 934
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 1,866 | 1,012
Cash and Cash Equivalents | 1,866 | 1,012
Short-term Investments | 0 | 0
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Non-marketable preferred stock |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 8 | 7
Cash and Cash Equivalents | 0 | 0
Short-term Investments | 0 | 0
Other Long-term Assets | $ 8 | $ 7

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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